The 35 ads, created by Dazzleship, feature the different Lego Team GB figures smiling above a strapline wishing the different athletes good luck, from the UK's boxers to gymnasts, further supported by digital outdoor executions.
Media buying has been handled by Carat and Posterscope.
The campaign runs for the next four weeks, with an animated billboard at Westfield Shepherd's Bush and three static ads within the Olympic Park.
Lego said that each outdoor site has the flexibility to adapt the billboard executions to time with the Olympics schedule, ensuring that the campaign remains in time with the sporting action.
Lego is the official product of the Olympics and the Team GB Lego figures are available in high street retailers including John Lewis and Tesco.
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